#container {
    margin-left: 200px;
    width: 200px;
    height: 360px;
    background-color: black;
    position: relative;
}
.model-cell {
    box-sizing: border-box;
    width: 20px;
    height: 20px;
    border: 1px solid white;
    position: absolute;
}
.active-model {
    background-color: cadetblue;
}
.fixed-model {
    background-color: bisque;
}